Headlight



March 29,1927. 3

S. F. LUCAS Filed Sept smut Jbffiuz Patented Mar. 29, 1927.

UNITED STATES PATENT OFFICE.

HEADLIGHT.

Application filed September 9, 1925. Serial No. 55,368.

Figure 1 is a central vertical section of the invention. 7

Figure 2 is a front view of the same.

The invention has relation to head-lights 6 for automobiles and othervehicles, having for an object to provide an improved headlight designedto reduce the glare to a minimum without sacrifice to suflicientillumination.

The invention consists in the novel construction and combinations ofparts as set forth in the appended claim.

In the accompanying drawings illustrating an embodiment of theinvention, the numeral 1 designates the reflector of the form of asegment of a hollow sphere, and 2, 2' electric light bulbs fixedadjacent the reflector and including a central bulb 2 and an annularseries of bulbs 2, located adjacent the outer margin of the reflectorandspaced apart by approximately equal distances from each other and fromsaid central bulb in front view.

These light bulbs are of low candle power, each usually eight candlepower or under,

although four candle power bulbs give excellent results in practice, andthe annular series of bulbs may be arranged each radially of thereflector or may project straight outwardly therefrom as does thecentral bulb 2.

The ordinary power of a focal light in a headlight reflector is fromtwenty one to thirty two candle power, and therefore the combined candlepower of the seven light bulbs of four candle power each would beapproximately the same.

The mirror surface of the reflector being spherical will distribute thelight rays from said bulbs fan fashion, and it is found in practice thatwith the seven light bulbs of four candle power each arranged as stated,the roadway will be illuminated sufficiently to make driving safe,objects being distinguishable at a distance of 150 feet, and the sidesof the road will be illuminated also to cause side roads to be visibleat a distance of from to feet and road signs readable at either side ofthe road with case.

In view of the fact that sufficient illumination is given both in frontand at the sides of the road, spot lights are rendered unnecessary.

By arranging the light bulbs as stated it is designed to produce anillumination in a fan shaped field of more e ual and softer characterwith a given expen iture of candle power in the light bulbs, thesegmental spherical surface reflector giving the best results.

I claim:-

In a non-glare vehicle headlight, a segmental spherical surfacereflector, a cover glass contacting with the margin of said reflector, acentral light socket, an annular series of light sockets intersectingsaid reflector near-the marginal portion thereof and spaced apart fromeach other and from said central light socket by substantially equaldistances, and. a.- light bulb of low candle power in each socket, thecombined candle power of said light bulbs being approximately equal tothe candle power of the focal light bulb usually employed.

In testimony whereof I affix my signature.

STEPHEN F. LUCAS.

